Dual-color laser light source and laser projector

ABSTRACT

The present application discloses a dual-color laser light projection device, wherein the dual-color laser light projection device includes a first blue laser transmitter, a second blue laser transmitter, a red laser transmitter, a light combining component, a fluorescent wheel, a light-pipe; wherein the fluorescent wheel comprises a green fluorescent region provided with a green fluorescent powder and a transmission region, and wherein the green fluorescent region is excited by a first blue laser emitted from the first blue laser transmitter to generates green fluorescence. The light path system of the present application is simple and has a small volume.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.15/857,591, filed on Dec. 28, 2017, which claims priority to ChinesePatent Application No. 201710712834.9, filed on Aug. 18, 2017 andentitled “Dual-color laser light source and laser projector”, and theChinese patent application No. 201710712832.X, filed on Aug. 18, 2017and entitled “Dual-color laser light source and laser projector”. Thedisclosures of the aforementioned applications are hereby incorporatedby reference in their entireties

TECHNICAL FIELD

The present application relates to the field of projection display, andspecifically to a dual-color laser light source and a laser projector.

BACKGROUND

Laser light sources are a light source with high brightness and strongdirectivity and which emits monochromatic beams. Due to its plenty ofadvantages, the laser light source has been applied ever increasingly inthe field of projection display in recent years. In contrast to aconventional monochromatic laser light source, dual-color laser lightsource may improve color purity, color brightness and color gamut of thelight source and better satisfy the demand for colors in laserprojection.

SUMMARY

Embodiments of the present application provide a dual-color laser lightsource and a laser projector. The technical solutions are as follows:

In a first aspect, the present application provides a dual-color laserlight projection device, wherein the dual-color laser light projectiondevice includes a first blue laser transmitter, a second blue lasertransmitter, a red laser transmitter, a light combining component, afluorescent wheel, a light-pipe; wherein the fluorescent wheel comprisesa green fluorescent region provided with a green fluorescent powder anda transmission region, and wherein the green fluorescent region isexcited by a first blue laser emitted from the first blue lasertransmitter to generates green fluorescence;

the light combining component is disposed on a light path between thefirst blue laser transmitter and the fluorescent wheel, a light pathbetween the light-pipe and the second blue laser transmitter and a lightpath between the light-pipe and the red laser transmitter;

the light combining component is configured to receive the first bluelaser, and to emit the first blue laser to the fluorescent wheel;

the light combining component is also configured to receive the greenfluorescence, a second blue laser emitted by the second blue lasertransmitter and a red laser emitted by the red laser transmitter, and toemit the green fluorescence, the second blue laser and the red laser tothe light-pipe.

Regarding the dual-color laser light projection device provided by theembodiments of the present application, the dual-color laser lightprojection device has a relatively simple light path system.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structural diagram for a dual-color laser light source inrelevant technology;

FIG. 2A is a structural diagram for a dual-color laser light sourceprovided by an embodiment of the present application;

FIG. 2B is a structural diagram for another dual-color laser lightsource provided by an embodiment of the present application;

FIG. 3A is a diagram for a fluorescent wheel provided by an embodimentof the present application;

FIG. 3B is a diagram for another fluorescent wheel provided by anembodiment of the present application;

FIG. 4 is a structural diagram for another dual-color laser light sourceprovided by an embodiment of the present application;

FIG. 5 is a diagram for a color filter wheel provided by an embodimentof the present application;

FIG. 6 is a structural diagram for yet another dual-color laser lightsource provided by an embodiment of the present application;

FIG. 7A is a structural diagram for yet another dual-color laser lightsource provided by an embodiment of the present application;

FIG. 7B is a structural diagram for yet another dual-color laser lightsource provided by an embodiment of the present application;

FIG. 8 is a structural diagram for yet another dual-color laser lightsource provided by an embodiment of the present application;

FIG. 9A is a structural diagram for yet another dual-color laser lightsource provided by an embodiment of the present application;

FIG. 9B is a structural diagram for yet another dual-color laser lightsource provided by an embodiment of the present application; and

FIG. 10 is a diagram for another fluorescent wheel provided by anembodiment of the present application.

DESCRIPTION OF EMBODIMENTS

In order to make the purpose, technical solutions and advantages of thepresent application clearer, implementations of the present applicationwill be further detailed in conjunction with the figures as below.

A laser light source is a light source with high brightness and strongdirectivity which emits monochromatic coherent beams, and has beenincreasingly applied into the field of projection and display due to itsnumerous advantages.

In relevant technology, as shown in FIG. 1, the dual-color laser lightsource generally includes a blue laser transmitter 101, a red lasertransmitter 102, a fluorescent wheel 103, a light beam shaping device104, a light combining component 105 and a light collecting component106. The principle of emergent light of the dual-color laser lightsource includes: the blue laser emitted by the blue laser transmitter101 passes through the light beam shaping device 104, is reflected bythe light combining component 105 onto the fluorescent wheel 103,transmits through the fluorescent wheel 103 and passes through a relayloop light path before arriving at the light combining component 105once again, so as to be reflected and outputted by the light combiningcomponent 105; the blue laser irradiates the fluorescent wheel 103, andmay excite the fluorescent wheel 103 to emit green fluorescence which istransmitted and outputted by the light combining component 105; redlaser emitted by the red laser transmitter 102 passes through the lightbeam shaping device 104, and is reflected and outputted by the lightcombining component 105; and lighting function of the laser light sourceis realized upon three lights with different colors enter into the lightcollecting component.

In some implementations, the laser light source may be used to a laserprojector which may emit light of at least one color to realize displayof images. Primary colors refer to “basic colors” which are not obtainedby blending other colors. Primary colors blended at different ratios maygenerate other new colors. The laser projector generally generates lightof primary colors to display patterns. Generally, the colors generatedby a laser projector are three primary ones, i.e., red, green and blue,and with the development of science and technology, a laser projectormay also generate two primary colors and a secondary color, or acombination of a primary color and other secondary colors, on which theembodiments of the present application will not make restrictions.

A laser projector may have various laser light sources, which mayinclude: at least one laser transmitter, wherein the laser light sourceis able to emit light of at least one color. Generally, the laser lightsource may also include: a fluorescent wheel (also referred to as afluorescence color wheel), which may serve as a wavelengthtransformation device. The laser light source may be a monochromaticlaser light source (i.e., include one kind of laser transmitter whichgenerates one color), and may also be a dual-color laser light source(i.e., include two kind of laser transmitters which each generate onecolor), so as to emit laser of one or two colors. The fluorescent wheelis provided with fluorescent powder which may be excited to generatefluorescence of corresponding colors, which jointly forms three primarycolors along with the color of the laser emitted by the lasertransmitter, thus acting as a projection light source for providinglighting to optical parts. The light source parts of the laser projectorinclude at least a laser transmitter and a fluorescent wheel. Theoptical parts of the laser projector include at least an imaging elementand a projection lens, wherein the imaging element can be a DMD elementor a LCOS element.

In comparison with a monochromatic laser light source, the dual-colorlaser light source may improve color purity, color brightness and colorgamut of a light source, and better satisfy the demand for colors inlaser projection.

The embodiments of the present application provide a dual-color laserlight source, as shown in FIG. 2A, the laser light source includes afirst blue laser transmitter 21 a, a second blue laser transmitter 21 b,a red laser transmitter 22, a fluorescent wheel 23, a light collectingcomponent 25 and a light combining component 24, wherein the fluorescentwheel 23 is provided with a green fluorescent region and a transmissionregion.

The light combining component 24 is arranged between the first bluelaser transmitter 21 a and the fluorescent wheel 23. The fluorescentwheel 23 is arranged between the light combining component 24 and thered laser transmitter 22. The light collecting component 25 and thesecond blue laser transmitter 21 b are respectively arranged on bothsides of the light combining component 25, the connection line betweenthe first blue laser transmitter 21 a and the fluorescent wheel 23 isperpendicular to the connection line between the light collectingcomponent 25 and the second blue laser transmitter 21 b.

The light combining component 24 is used to transmit first blue laseremitted by the first blue laser transmitter 21 a to the fluorescentwheel 23, and to reflect green fluorescence onto the light collectingcomponent 25 after receiving the green fluorescence generated by thefirst blue laser irradiating the green fluorescent region.

The light combining component 24 is also used to receive second bluelaser emitted by the second blue laser transmitter 21 b, and to transmitthe second blue laser to the light collecting component 25.

The light combining component 24 is also used to receive red laser whichis emitted by the red laser transmitter 22 and which transmits throughthe transmission region, and to reflect the red laser onto the lightcollecting component 25.

As shown in FIG. 2A, the first blue laser transmitter 21 a, the secondblue laser transmitter 21 b, the light combining component 24 and thelight collecting component 25 are arranged on a first side of thefluorescent wheel 23. The red laser transmitter 22 is arranged on asecond side of the fluorescent wheel 23. The light combining component24 is arranged between the first blue laser transmitter 21 a and thefluorescent wheel 23, and the light combining component 24 is arrangedbetween the second blue laser transmitter 21 b and the light collectingcomponent 25.

It is noted that the laser transmitter provided by the embodiment of thepresent application may be a laser transmitter array or a separate lasertransmitter, and the connection line between the first blue lasertransmitter 21 a and the fluorescent wheel 23 is perpendicular to theconnection line between the light collecting component 25 and the secondblue laser transmitter 21 b. The two connection lines are notnecessarily absolutely perpendicular to each other, and the includedangle therebetween may somewhat deviate from a right angle, as long assatisfying that the light from the laser transmitter and the fluorescentwheel can enter the light collecting component 25.

In some implementations, as shown in FIG. 2B, the red laser transmitter22 includes: a first red laser transmitter 22 a and a second red lasertransmitter 22 b. The red laser includes: a first red laser and a secondred laser.

The light combining component 24 is also used to respectively reflectthe first red laser and the second red laser which are emitted by thefirst red laser transmitter 22 a and the second red laser transmitter 22b and which transmit through the transmission region onto the lightcollecting component 25.

a polarization direction of the first red laser is perpendicular to apolarization direction of the second red laser.

In some implementations, the first red laser transmitter 22 a and thesecond red laser transmitter 22 b may be arranged in parallel on asecond side of the fluorescent wheel, and the light is reflected by thereflection device onto the fluorescent wheel 23; alternatively, thefirst red laser transmitter 22 a and the second red laser transmitter 22b may be arranged in parallel at a position opposite the first bluelaser transmitter 21 a, for directly emitting the first red laser andthe second red laser to the fluorescent wheel 23; alternatively, asshown in FIG. 2B, the laser light source also includes a dichroic sheet28 which is used to reflect the second red laser and to transmit thefirst red laser.

In some implementations, as shown in FIG. 2A, the dual-color laser lightsource may also include multiple light beam shaping devices andreflection devices 28, alternatively, as shown in FIG. 2B, thedual-color laser light source may also include multiple light beamshaping devices and dichroic sheets 28. The multiple light beam shapingdevices include a first light beam shaping device A, a second light beamshaping device B, a third light beam shaping device C, a fourth lightbeam shaping device D and a fifth light beam shaping device E.

The first light beam shaping device A, the second light beam shapingdevice B, the third light beam shaping device C and the fourth lightbeam shaping device D may be a telescopic system (in practicalapplication, the telescopic system may include a convex lens and aconcave lens), and is used to condense the parallel laser emitted by thelaser transmitter, so as to reduce the area of the light beam, and thecondensed laser is still parallel laser, which may improve transmittanceof the parallel laser in back end optical devices.

The fifth light beam shaping device E may be composed of two lenses. Thefirst blue laser is focused by the two lens to irradiate the fluorescentwheel, and the green fluorescence emitted by the fluorescent wheel andthe red laser emitted by the red laser transmitter may be performedcollimation by the two lens before entering the light combiningcomponent, improving uniformity of the emergent light.

The fifth light beam shaping device E may also be composed of one, threeor four lenses. And the embodiments of the present application make nolimitations on the number of the lenses composing the fifth light beamshaping device E.

In the embodiments of the present application, a light path emissionprocess of the provided dual-color laser light source includes: afterpassing through the first light beam shaping device A, the first bluelaser, transmits through the light combining component 24 and afterpassing through the fifth light beam shaping device E, irradiates ontothe fluorescent wheel 23 for exciting the green fluorescent powder toemit green fluorescence; the green fluorescence passes through the fifthlight beam shaping device E before being reflected by the lightcombining component 24 onto the light collecting component 25; thesecond blue laser passes through the second light beam shaping device B,before transmitting through the light combining component 24 to beoutputted to the light collecting component 25; the red laser emitted bythe red laser transmitter 22 passes through fourth light beam shapingdevice D, and is then reflected by the reflection device 28 onto thefluorescent wheel 23, after transmitting through the fluorescent wheel23, the red laser passes through the fifth light beam shaping device Eand is reflected by the light combining component 24 to be outputted tothe light collecting component 25. Three lights with different colorsenter the light collecting component 25 and after that may blend intowhite light, realizing the displaying function of the dual-color laserlight source.

The reflection device 28 may be a reflection sheet which may bepositioned to form an included angle of 45° with the red lasertransmitter, so that after being reflected by the reflection sheet, thered laser emitted by a horizontally positioned red laser transmitter mayenter the fluorescent wheel in a perpendicular way, enabling the redlaser to be emitted in a preset light path, thus guaranteeing stabilityin laser emission.

In some implementations, the reflection device 28 may be a seconddichroic sheet, for reflecting the red laser onto the fluorescent wheel23.

In some implementations, in other embodiments, the red laser transmitter22 may be arranged, opposite to the first blue laser transmitter 21 a.The both side of the fluorescent wheel 23, and the red laser emitted bythe red laser transmitter 22 is directly emitted to the fluorescentwheel 23, without being emitted via the reflection device.

In some implementations, the light collecting component may be alight-pipe.

In summary, in the dual-color laser light source provided by theembodiments of the present application, the laser light source includesa first blue laser transmitter, a second blue laser transmitter, a redlaser transmitter, a fluorescent wheel, a light collecting component anda light combining component, wherein the fluorescent wheel is providedwith a green fluorescent region and a transmission region; the lightcombining component is arranged between the first blue laser transmitterand the fluorescent wheel. The fluorescent wheel is arranged between thelight combining component and the red laser transmitter. The lightcollecting component and the second blue laser transmitter arerespectively arranged on both sides of the light combining component.The connection line between the first blue laser transmitter and thefluorescent wheel is perpendicular to the connection line between thelight collecting component and the second blue laser transmitter. Thefirst blue laser emitted by the first blue laser transmitter is able totransmit through the light combining component and to excite the greenfluorescent region of the fluorescent wheel to emit green fluorescence,then the light combining component reflects the green fluorescence ontothe light collecting component. The second blue laser emitted by thesecond blue laser transmitter transmits through the light combiningcomponent to the light collecting component, and red laser emitted bythe red laser transmitter transmits through the transmission region ofthe fluorescent wheel before being reflected by the light combiningcomponent onto the light collecting component. The dual-color laserlight source has a relatively simple light path system.

In some implementations, the first red laser is p polarized light, thesecond red laser is s polarized light, the first blue laser is ppolarized light, and the second blue laser is s polarized light;

Alternatively, the first red laser is s polarized light, the second redlaser is p polarized light, the first blue laser is s polarized light,and second blue laser is p polarized light.

In the above implementations, the red laser collected by the lightcombining component is converted light of first red laser and second redlaser with polarization direction perpendicular to each other, overlayof the two polarized light is able to form overlay of phase patternsduring image projection, so as to generate more independent random phasepatterns, efficiently reducing speckle effects of the red laser whileimproving the optical quality of the dual-color laser light source.

In the embodiments of the present application, the first blue lasertransmitter, the second blue laser transmitter and the red lasertransmitter are each turned on in sequence. In some implementations, thefirst blue laser transmitter, the second blue laser transmitter and thered laser transmitter are turned on at different moments. In someimplementations, if the red laser transmitter includes the first redlaser transmitter and the second red laser transmitter, the first redlaser transmitter and the second red laser transmitter are turned on insequence, or the first red laser transmitter and the second red lasertransmitter are turned on at the same moment. When the first red lasertransmitter and the second red laser transmitter are turned on insequence, it is required that the outputted first red laser and secondred laser are emitted to the transmission region of the fluorescentwheel.

In some implementations, as shown in FIG. 3A, the fluorescent wheel mayinclude a green fluorescent region Y and a transmission region K, thesurface of the green fluorescent region Y is provided with greenfluorescent powder, and the surface of the transmission region Y isprovided with a first diffuser. The green fluorescent region and thetransmission region are both in a fan-shaped arrangement, and duringrotation, the fluorescent wheel is able to emit green fluorescence andto transmit red laser in sequence.

The first diffuser may is a micron-level particle.

In same applications, the fluorescent wheel may rotate at a presetrotation speed, and when the first blue laser transmitter is turned on,the green fluorescent region of the fluorescent wheel is aligned withthe fifth light beam shaping device E (the green fluorescent region isan irradiated region of the first blue laser), and both the second bluelaser transmitter and the red laser transmitter are not turned on. Whenthe red laser transmitter is turned on, the transmission region of thefluorescent wheel is aligned with the fifth light beam shaping device E(the transmission region is an irradiated region of the laser), and boththe first blue laser transmitter and the second blue laser transmitterare not turned on. When the second blue laser transmitter is turned on,both the first blue laser transmitter and the red laser transmitter arenot turned on.

Since the central area of the fluorescent wheel is unable to be alignedwith the fifth light beam shaping device, i.e., the central area of thefluorescent wheel is unable to serve as an irradiated region of thelaser at any moment, hence as shown in FIG. 3B, the fluorescent wheelmay also include a blank area Q which is positioned in the central areaof the fluorescent wheel, and the green fluorescent region Y ispositioned on the periphery of the blank area Q. The green fluorescentregion Y is in a fan-shaped circular arrangement, and the transmissionregion K is in a fan-shaped or a fan-shaped circular arrangement.

As shown in FIG. 4, the light combining component may include: a firstdichroic sheet 241 which is arranged on a light incident side of thelight collecting component 25. The first dichroic sheet 241 is used totransmit the first blue laser and the second blue laser, and to reflectthe green fluorescence and to reflect the red laser emitted by the redlaser transmitter 22.

In some implementations, as shown in FIG. 4, the laser light source mayalso include a fixed diffusion sheet 242 for homogenizing first bluelaser. Because the first blue laser is excited light of the fluorescentwheel, if the beam is not homogenized, then the laser with light spotsof uneven intensity distribution and thus concentrated energy willdirectly enter the surface of the fluorescent wheel, and the laser lightspots with concentrated energy are likely to burn the surface of thefluorescent wheel and to damage the fluorescent wheel, leading to thatthe laser is unable to normally excite the fluorescent wheel to emitfluorescence.

In some implementations, as shown in FIG. 4, the laser light source mayalso include: a color filter wheel 26 which is arranged between thefirst dichroic sheet 241 (the light combining component) and a lightincident side of the light collecting component 25. As shown in FIG. 5,the color filter wheel may include a red light filter region R, a bluelight filter region B and a green light filter region G. Duringrotation, the color filter wheel is able to sequentially transmit thesecond blue laser, the red laser and the green fluorescence.

In some implementations, when the color filter wheel is rotated, and theirradiated region of the color filter wheel is a blue light filterregion, the second blue laser transmitter is turned on, while the firstblue laser transmitter and the red laser transmitter are not turned on.When the irradiated region of the color filter wheel is a red lightfilter region, the red laser transmitter is turned on while both thefirst blue laser transmitter and the second blue laser transmitter arenot turned on. When the irradiated region of the color filter wheel is agreen light filter region, the first blue laser transmitter is turned onwhile the second blue laser transmitter and the red laser transmitterare not turned on, so as to sequentially transmit the second blue laser,the red laser and the green fluorescence.

In some implementations, as shown in FIG. 4, the laser light source mayalso include a focusing lens 243 which is arranged between the firstdichroic sheet 241 and the color filter wheel 26. Due to the fact thatwhen the divergence angle of the light beam transmitted through thefirst dichroic sheet or reflected by the first dichroic sheet is greaterthan the collection angle of the light collecting component, the resultis reduced light collection efficiency, impacting the brightness of theprojection light source. The focusing lens may be used to focus thesecond blue laser transmitted through the first dichroic sheet and thegreen fluorescence reflected by the first dichroic sheet and the redlaser reflected by the first dichroic sheet respectively, so as toimprove the light collection efficiency by the light collectingcomponent, thereby improving the brightness of the projection lightsource.

In some implementations, in the color filter wheel provided by theembodiment of the present application, the surface of the red lightfilter region is provided with a second diffuser, the surface of theblue light filter region is provided with a third diffuser. The seconddiffuser and the third diffuser may be micron-level particles, particlediameter of the third diffuser may be the same with particle diameter ofthe second diffuser, wherein, the particle diameter of the seconddiffuser is different from particle diameter of the first diffuserarranged on the surface of the transmission region of the fluorescentwheel.

Strong coherence of the laser inevitably results in speckle effects. Theso-called speckles refer to the phenomenon that, when a coherent lightsource irradiates a rough object, the diverged light, with equalwavelength and a constant phase, creates interference in space, wherepartly being constructive interference and partly being destructiveinterference, finally occurring granulate light and dark spots on ascreen, i.e., some unfocused smudging, which is likely to develop asense of dizziness after long-time watching, which inevitably bringsquality deterioration of projected images, reducing the viewingexperience of users. In contrast to blue laser, red laser has a longercoherence length and higher coherence, and thus has a more severespeckle phenomenon.

In the embodiments of the present application, when passing thefluorescent wheel, the red laser emitted by the red laser transmitter isfirstly subjected to a first diffusion by a first diffuser on thetransmission region of the fluorescent wheel, and after reflecting bythe light combining component, hen subjected to a second diffusion by asecond diffuser on the red light filter region of the color filterwheel. Because the particle diameter of the first diffuser is differentfrom the particle diameter of the second diffuser, thus diffusion anglesfor the red laser is different, which may cause the red laser togenerate more independent random phase patterns; In someimplementations, because both the fluorescent wheel and the color filterwheel rotate, the moving diffuser may further increases the randomphases, and is better able to destroy coherence of the red laser,allowing a laser light source for projection to be able to form moreindependent random phase patterns in a projected image. And the more thenumber of the independent random phase patterns, the weaker thephenomenon of the light and dark spots, under an integral function ofhuman eye, so as to efficiently reduce the speckle effects of the redlaser, and to improve optical quality of a dual-color laser lightsource.

In some implementations, the particle diameter of the first diffuser maybe greater than the particle diameter of the second diffuser, forexample, the particle diameter of the first diffuser is 100 microns, andthe particle diameters of the second diffuser and the particle diametersof the third diffuser are 30 microns. Firstly the first diffuser mayscatter the red laser, then the second diffuser rearranges the phase ofthe red laser accurately.

It is noted that the particle diameter of the first diffuser may also besmaller than that of the second diffuser, for example, the particlediameter of the first diffuser is 30 microns, and those of the seconddiffuser and the third diffuser are 100 microns.

In addition, the third diffuser on the blue light filter region of thecolor filter wheel is used for homogenizing second blue laser,fulfilling the role of removing speckles of the blue laser; and thegreen light filter region on the color filter wheel is used to filterthe green fluorescence, allowing the green light entering the lightcollecting component to be purer.

In the above implementations, the arrangements of the first diffuser onthe surface of the transmission region of the fluorescent wheel, and thearrangements of the second diffuser on the surface of the red lightdiffusion region of the color filter wheel, realize twice diffusion ofthe red laser with high coherence while delivering a preferable speckleremoval effect for the red laser, thus improving optical quality of thedual-color laser light source.

Some embodiments of the present application provides a dual-color laserlight source, as shown in FIG. 6, the laser light source at leastincludes:

a first blue laser transmitter 21 a, a second blue laser transmitter 21b, a red laser transmitter 22, a fluorescent wheel 23, a lightcollecting component 25 and a light combining component 24, thefluorescent wheel 23 is provided with a green fluorescent region and atransmission region;

the light combining component 24 is arranged between the first bluelaser transmitter 21 a and the fluorescent wheel 23, the fluorescentwheel 23 is arranged between the light combining component 24 and thesecond blue laser transmitter 21 b, the light collecting component 25and the red laser transmitter 22 are respectively arranged on both sidesof the light combining component 24. A connection line between the firstblue laser transmitter 21 a and the fluorescent wheel 23 isperpendicular to a connection line between the light collectingcomponent 25 and the red laser transmitter 22.

The light combining component 24 is used to transmit first blue laseremitted by the first blue laser transmitter 21 a to the fluorescentwheel 23, and to reflect green fluorescence onto the light collectingcomponent 25 after receiving the green fluorescence generated by thefirst blue laser irradiating the green fluorescent region.

The light combining component 24 is also used to receive red laseremitted by the red laser transmitter 22 and to transmit the red laser tothe light collecting component 25.

The light combining component 24 is also used to receive second bluelaser which is emitted by the second blue laser transmitter 21 b andtransmitted through the transmission region, and to reflect the secondblue laser onto the light collecting component 25.

A polarization direction of the second blue laser is perpendicular to apolarization direction of the first blue laser.

In some implementations, the light path emission process of thedual-color laser light source provided by the embodiment of the presentapplication includes: after transmitting through the light combiningcomponent 24, the first blue laser irradiates the fluorescent wheel 23,exciting the green fluorescent region of the fluorescent wheel to emitgreen fluorescence, wherein the green fluorescence is reflected by thelight combining component 24 to be outputted to the light collectingcomponent 25. The second blue laser transmits through the fluorescentwheel 23 onto the light combining component 24, and is then reflected bythe light combining component 24 to be outputted to the light collectingcomponent 25. The red laser emitted by the red laser transmitter 22transmits through the light combining component 24 to be outputted tothe light collecting component 25. The three lights with differentcolors enter the light collecting component 25 and may be blended toform white light, so as to realize a lighting function of the dual-colorlaser light source or display a picture.

In some implementations, as shown in FIG. 7A, the red laser transmitterincludes: a first red laser transmitter 22 a and a second red lasertransmitter 22 b. The red laser includes first red laser and second redlaser. The first red laser transmitter and the second red lasertransmitter are arranged in parallel, and both are arranged on anotherside of the light combining component 24 relative to the lightcollecting component 25.

The light combining component 24 is also used to respectively receivefirst red laser emitted by the first red laser transmitter 22 a andsecond red laser emitted by the second red laser transmitter 22 b, andto transmit the first red laser and the second red laser to the lightcollecting component 25.

A polarization direction of the first red laser is perpendicular to apolarization direction of the second red laser.

Since the red laser collected by the light combining component isconverted light of first red laser and second red laser with thepolarization directions perpendicular to each other, overlay of the twopolarized light is able to form overlay of phase patterns during imageprojection, so as to generate more independent random phase patterns,efficiently reducing speckle effects of the red laser while improvingthe optical quality of the dual-color laser light source.

In some implementations, the first blue laser transmitter, the secondblue laser transmitter and the red laser transmitter are each turned onin sequence. In some implementations, the first red laser transmitterand the second red laser transmitter of the red laser transmitter areturned on at the same moment, or the first red laser transmitter and thesecond red laser transmitter are turned on in sequence.

In some implementations, as shown in FIG. 7B, the light combiningcomponent includes a first dichroic sheet 241 which is arranged on alight incident side of the light collecting component 25;

The first dichroic sheet 241 is used to transmit the red laser and thefirst blue laser, and to reflect the green fluorescence and the secondblue laser.

In some implementations, as shown in FIG. 7B, the laser light sourcealso includes a second dichroic sheet 245. The fluorescent wheel 23 ispositioned between the second dichroic sheet and the light combiningcomponent 24. The light emergent direction of the second blue lasertransmitter 21 b is perpendicular to the axial direction of thefluorescent wheel 23. The second dichroic sheet 245 is used to reflectthe second blue laser onto the fluorescent wheel. In some otherimplementations, the second blue laser transmitter 21 b may directlyface towards the fluorescent wheel, hence there is no need to arrangethe dichroic sheet 245.

In some implementations, as shown in FIG. 3A, the fluorescent wheel mayinclude a green fluorescent region Y and a transmission region K. Thesurface of the green fluorescent region Y is provided with greenfluorescent powder. The surface of the transmission region Y is providedwith a first diffuser. Both the green fluorescent region and thetransmission region are in a fan-shaped arrangement. During rotation,the fluorescent wheel is able to emit the green fluorescence and totransmit the second blue laser in sequence.

In this application, the fluorescent wheel may rotate at a presetrotation speed. When the first blue laser transmitter is turned on, thegreen fluorescent region of the fluorescent wheel is aligned with afifth light beam shaping device E (the green fluorescent region is anirradiated region of the laser). Both the second blue laser transmitterand the red laser transmitter are not turned on. When the second bluelaser transmitter is turned on, the transmission region of thefluorescent wheel is aligned with the fifth light beam shaping device E(the transmission region is an irradiated region of the laser), and boththe first blue laser transmitter and the second blue laser transmitterare not turned on. When both the first blue laser transmitter and thered laser transmitter are not turned on; when both the first blue lasertransmitter and the second blue laser transmitter are not turned on, thered laser transmitter is turned on.

Since the central area of the fluorescent wheel is unable to be alignedwith the fifth light beam shaping device, i.e., the central area of thefluorescent wheel is unable to serve as an irradiated region of thelaser at any moment, hence as shown in FIG. 3B, the fluorescent wheelmay also include a blank area Q which is positioned in the central areaof the fluorescent wheel. The green fluorescent region Y is positionedon the periphery of the blank area Q, wherein the green fluorescentregion Y is in a fan-shaped circular arrangement, and the transmissionregion K is in a fan-shaped or a fan-shaped circular arrangement.

The realization principle and technical effect in this embodiment aresimilar to those in the aforementioned embodiment, and will not berepeated herein.

In some implementations, as shown in FIG. 8, the laser light source atleast includes:

a first blue laser transmitter 21 a, a second blue laser transmitter 21b, a first red laser transmitter 22 a and a second red laser transmitter22 b, a fluorescent wheel 23, a light collecting component 25 and alight combining component 24, wherein the fluorescent wheel is providedwith a green fluorescent region and a transmission region.

The light combining component 24 is arranged between the first bluelaser transmitter 21 a and the fluorescent wheel 23, wherein thefluorescent wheel 23 is arranged between the light combining component24 and the second blue laser transmitter 21 b. The light collectingcomponent 25 and the first red laser transmitter 22 are arranged on bothsides of the light combining component 24, respectively, a connectionline between the first blue laser transmitter 21 a and the fluorescentwheel 23 is perpendicular to a connection line between the lightcollecting component 25 and the first red laser transmitter 22 a.

The second red laser transmitter 22 b and the second blue lasertransmitter 21 b are arranged on the same side of the fluorescent wheel23.

The light combining component 24 is used to transmit first blue laseremitted by the first blue laser transmitter 21 a to the fluorescentwheel 23, and to reflect the green fluorescence onto the lightcollecting component 25 after receiving the green fluorescence generatedby the first blue laser irradiating the green fluorescent region.

The light combining component 24 is also used to receive first red laseremitted by the first red laser transmitter 22 a and to transmit thefirst red laser to the light collecting component 25.

The light combining component 24 is also used to reflect the second redlaser which is emitted by the second red laser transmitter 22 b andtransmitted through the transmission region to the light collectingcomponent 25.

The light combining component is also used to receive first red laseremitted by the first red laser transmitter 22 a and to transmit thefirst red laser to the light collecting component 25.

A polarization direction of the first red laser is perpendicular to apolarization direction of the second red laser.

In some implementations, the light collecting component may be alight-pipe.

It is illustrated that the laser transmitter provided by the embodimentof the present application may be an array of laser transmitters.

As shown in FIG. 8, the first blue laser transmitter 21 a, the first redlaser transmitter 22 a, the light combining component 24 and the lightcollecting component 25 are arranged on a first side of the fluorescentwheel 23. The second blue laser transmitter 21 b and the second redlaser transmitter 22 b are arranged on a second side of the fluorescentwheel 23. The light combining component 24 is arranged between the firstblue laser transmitter 21 a and the fluorescent wheel 23, and the lightcombining component 24 is arranged between the first red lasertransmitter 22 a and the light collecting component 25.

Correspondingly, a polarization direction of the second blue laser isperpendicular to a polarization direction of the first blue laser, andthe polarization direction of the second blue laser is parallel with thepolarization direction of the second red laser. The light combiningcomponent 24 is used to transmit the first blue laser and the first redlaser, and to reflect the second blue laser and the second red laser.

In some implementations, as shown in FIG. 8, in the dual-color laserlight source provided by the embodiment of the present application, theside on the light emergent surface of each of the laser transmitters maybe provided with a light beam shaping device, which are a first lightbeam shaping device A, a second light beam shaping device B, a thirdlight beam shaping device C and a fourth light beam shaping device D,respectively. The light beam shaping device may be a telescopic system(in practical applications, the telescopic system may include one convexlens and one concave lens), for condensing the parallel laser emitted bythe laser transmitters, so as to reduce the area of the beam, and thecondensed laser is still parallel laser, which may improve transmittanceof the parallel laser in a back end optical device.

In some implementations, as shown in FIG. 8, a fifth light beam shapingdevice E may be provided between the light combining component 24 andthe fluorescent wheel 23, wherein the fifth light beam shaping device Emay be composed of two lens. The first blue laser emitted by the firstblue laser transmitter is focused by the two lens before irradiating thefluorescent wheel. The green fluorescence emitted by the fluorescentwheel may be performed collimation by the two lens before entering thelight combining component, improving uniformity of the emergent light.The fifth light beam shaping device E is also used to performcollimation to the second blue laser and the second red laser. In someimplementations, the fifth light beam shaping device E may also becomposed of one, three or four lenses, and there will be no restrictionson the number of the lenses composing the light beam shaping device inthe embodiment of the present application.

Because a direction of the second blue laser emitted by the second bluelaser transmitter 21 b is perpendicular to a direction of the second redlaser emitted by the second red laser transmitter 22 b. Then as shown inFIG. 8 and FIG. 9A, the dual-color laser light source may also include:a third dichroic sheet 246 which is positioned between the second bluelaser transmitter 21 b and the fluorescent wheel 23, wherein the thirddichroic sheet 246 may be used to transmit the second blue laser to thefluorescent wheel, and to reflect the second red laser onto thefluorescent wheel. At present, the first blue laser transmitter and thesecond blue laser transmitter are arranged on both side of thefluorescent wheel opposite to each other. In some implementations, asshown in FIG. 9B, the dual-color laser light source may also include: afourth dichroic sheet 247 which is positioned between the second redlaser transmitter 22 b and the fluorescent wheel 23. The fourth dichroicsheet may be used to transmit the second red laser to the fluorescentwheel, and to reflect the second blue laser onto the fluorescent wheel.

In the embodiment of the present application, the third dichroic sheet246 may be positioned to form an included angle of 45° with the secondred laser transmitter 22 b, so that after being reflected by the thirddichroic sheet, the second red laser emitted by a horizontallypositioned second red laser transmitter may enter the fluorescent wheelin a perpendicular way, thereby enabling the second red laser to beemitted in a preset light path, thus ensuring stability in laseremission. In some implementations, the fourth dichroic sheet 247 may bepositioned to form an included angle of 45° with the second blue lasertransmitter 21 b, so that after being reflected by the fourth dichroicsheet, the second blue laser emitted by a horizontally positioned secondblue laser transmitter may enter the fluorescent wheel in aperpendicular way, thereby enabling the second blue laser to be emittedin a preset light path, thus ensuring stability in laser emission.

The light path emission process of the dual-color laser light source asshown in FIG. 8 and FIG. 9A includes: after passing through the firstlight beam shaping device A, the first blue laser emitted by the firstblue laser transmitter 21 a transmits through the light combiningcomponent 24, and then passes through the fifth light beam shapingdevice E and irradiates onto the fluorescent wheel 23, thereby excitingthe green fluorescent powder to emit green fluorescence, wherein thegreen fluorescence passes through the fifth light beam shaping device Eand is then reflected by the light combining component 24 to beoutputted. The second blue laser emitted by the second blue lasertransmitter 21 b passes through the second light beam shaping device B,and then transmits through the third dichroic sheet 246 onto thefluorescent wheel 23, and after transmitting through the fluorescentwheel 23, the second blue laser passes through the fifth light beamshaping device E and is reflected by the light combining component 24 tobe outputted. After passing through the third light beam shaping deviceC, the first red laser emitted by the first red laser transmitter 22 atransmits through the light combining component 24 to be outputted, andafter passing through the fourth light beam shaping device D, the secondred laser emitted by the second red laser transmitter 22 b is reflectedby the third dichroic sheet 246 onto the fluorescent wheel 23, whereinthe second red laser transmits through the fluorescent wheel 23, thenpasses through the fifth light beam shaping device E and is thenreflected by the light combining component 24 to be outputted. Aconverted light of the first red laser and the second red laser is thered laser finally outputted from the light combining component 24. Threelights with different colors enter the light collecting component 25 andmay be blended to form white light, thereby fulfilling the lightingfunction of the dual-color laser light source.

In summary, in the dual-color laser light source provided by theembodiment of the present application, since the red laser collected bythe light combining component is converted light of the first red laserand the second red laser with polarization directions perpendicular toeach other, overlay of the two polarized light is able to form overlayof phase patterns during image projection, so as to generate moreindependent random phase patterns, thereby efficiently reducing speckleeffects of the red laser while improving the optical quality of thedual-color laser light source.

In the embodiments of the present application, the first blue lasertransmitter, the second blue laser transmitter, the first red lasertransmitter and the second red laser transmitter are each turned on insequence. Or the first blue laser transmitter, the second blue lasertransmitter and the red laser transmitter are each turned on insequence, wherein the first red laser transmitter and the second redlaser transmitter of the red laser transmitter are turned on at the samemoment. As shown in FIG. 9A and FIG. 9B, the light combining componentmay include a polarization-combining dichroic sheet 244 which isarranged on the light incident side of the light collecting component25, and is used to transmit the first blue laser and the first redlaser, and to reflect the green fluorescence, the second blue laser aswell as the second red laser.

In some implementations, the first red laser is p polarized light. Thesecond red laser is s polarized light. The first blue laser is ppolarized light. And the second blue laser is s polarized light.Correspondingly, the arranged polarization-combining dichroic sheet maytransmit the p polarized light, and reflect the s polarized light.

Alternatively, the first red laser is s polarized light. The second redlaser is p polarized light. The first blue laser is s polarized light.And the second blue laser is p polarized light. Correspondingly, thearranged polarization-combining dichroic sheet may transmit the spolarized light, and reflect the p polarized light.

It is noted that the polarization-combining dichroic sheet may alsoreflect the green fluorescence.

In some implementations, as shown in FIG. 9A and FIG. 9B, the laserlight source may also include a color filter wheel 27 which is arrangedbetween the polarization-combining dichroic sheet 244 (the lightcombining component) and the light incident side of the light collectingcomponent 25. As shown in FIG. 5, the color filter wheel may include ared light filter region R, a blue light filter region B and a greenlight filter region G. During rotation the color filter wheel is able totransmit the second blue laser, red laser and the green fluorescence insequence.

In some implementations, during rotation of the color filter wheel, whenthe irradiated region of the color filter wheel is the blue light filterregion, the second blue laser transmitter is turned on, while the firstblue laser transmitter, the first red laser transmitter and the secondred laser transmitter are not turned on; when the irradiated region ofthe color filter wheel is the red light filter region, the first redlaser transmitter and the second red laser transmitter are turned on,while both the first blue laser transmitter and the second blue lasertransmitter are not turned on; when the irradiated region of the colorfilter wheel is the green light filter region, the first blue lasertransmitter is turned on while the second blue laser transmitter, thefirst red laser transmitter and the second red laser transmitter are notturned on, so as to transmit the second blue laser, the red laser andthe green fluorescence in sequence.

In the embodiment of the present application, in order to enhance thespeckle removal effect, preferably, a region capable of transmitting thered light on the color filter wheel is but not limited to the red lightfilter region.

In some implementations, as shown in FIG. 9A and FIG. 9B, the laserlight source may also include a fixed diffusion sheet 242 forhomogenizing blue laser emitted by the first blue laser transmitter. Andbecause the blue laser emitted by the first blue laser transmitter isexcited light of the fluorescent wheel. If the beam is not homogenized,the light spot of laser will have uneven intensity distribution andconcentrated energy. Hence when directly entering the fluorescent wheelsurface, the energy-concentrated laser spot is likely to burn thesurface of the fluorescent wheel and damage the fluorescent wheel,causing the laser unable to normally excite the fluorescent wheel toemit the fluorescence.

In some other implementations, as shown in FIG. 9A and FIG. 9B, thelaser light source may also include a focusing lens 243 which isarranged between the polarization-combining dichroic sheet 244 and thecolor filter wheel 27. Because when the beam diffusion angle of thelight transmitted through or reflected by the polarization-combiningdichroic sheet is larger than the collection angle of the lightcollecting component, hence the light collection efficiency is reduced,and the brightness of the projection light source is influenced. Thefocusing lens may be used to respectively focus the first red lasertransmitted through the polarization-combining dichroic sheet, and thegreen fluorescence, the second blue laser, and the second red laserreflected by the polarization-combining dichroic sheet, improving thelight collection efficiency by the light collecting component, so as toimprove the brightness of the projection light source.

In some implementations, in the color filter wheel provided by theembodiment of the present application, the surface of the red lightfilter region may be provided with a second diffuser, and the surface ofthe blue light filter region may be provided with a third diffuser. Thesecond diffuser and the third diffuser may be micron-level particles.

As shown in FIG. 10, the fluorescent wheel may include a greenfluorescent region Y and a transmission region, wherein the transmissionregion may include a red light diffusion region R1 and a blue lightdiffusion region B1. The surface of the green fluorescent region Y isprovided with green fluorescent powder. The surfaces of the red lightdiffusion region R1 and the blue light diffusion region B1 arerespectively provided with a first diffuser which is micron-levelparticles. During rotation, the fluorescent wheel is able to emit thegreen fluorescence, to transmit the second blue laser and the second redlaser in sequence.

In the embodiment of the present application, in order to enhance thespeckle removal effect, preferably, a region capable of transmitting thered light through the transmission region of the fluorescent wheel isthe red light diffusion region. The region capable of transmitting theblue light is the blue light diffusion region. The above descriptionsare not indented to make limitations.

It is noted that the particle diameter of the diffuser arranged on thesurface of the fluorescent wheel is different from particle diameter ofthe diffuser arranged on the surface of the color filter wheel.

Strong coherence of the laser inevitably results in speckle effects. Theso-called speckles refer to the phenomenon that, when a coherent lightsource irradiates a rough object, because the diverged light has equalwavelength and a constant phase, an interference may be created inspace, where partly being constructive interference and partly beingdestructive interference. The final result is that granulate light anddark spots on a screen is occurred, i.e., some unfocused smudging, whichis likely to develop a sense of dizziness after long-time watching,which inevitably brings about quality deterioration of projected images,reducing the viewing experience of users.

In the embodiment of the present application, when passing through thefluorescent wheel, the second blue laser emitted by the second bluelaser transmitter is firstly subjected to first diffusion by the firstdiffuser on the blue light diffusion region of the fluorescent wheel.Then after entering the light combining component, the second blue laseris subjected to subjected to second diffusion by the third diffuser onthe blue light filter region of the color filter wheel. Because theparticle diameter of the first diffuser on the blue light diffusionregion of the fluorescent wheel is different from the particle diameterof the third diffuser on the blue light filter region of the colorfilter wheel, hence a diffusion angles for the second blue laser isdifferent, which may cause the second blue laser to generate moreindependent random phase patterns. In some implementations, since boththe fluorescent wheel and the color filter wheel conduct rotation, themoving diffuser may further increase the random phases, which may bebetter able to destroy the coherence of the blue laser, allowing thelaser light source for projection to form more independent random phasepatterns on a projected image. Likewise, a principle of speckle removalof the second red laser may follow a principle referring to that of thesecond blue laser, and will not be repeated herein. The more the numberof the independent random phase patterns, the weaker the phenomenon ofthe light and dark spots under an integral function of human eye, so asto efficiently reduce the speckle effects of the laser, and to improveoptical quality of a dual-color laser light source.

In some implementations, a particle diameter of the diffuser arranged onthe surface of the fluorescent wheel may be greater than a particlediameter of the diffuser arranged on the surface of the color filterwheel, for example, the particle diameter of the diffuser arranged onthe surface of the fluorescent wheel is 100 microns, and the particlediameter of the diffuser arranged on the surface of the color filterwheel is 30 microns. Firstly, the diffuser arranged on the surface ofthe fluorescent wheel may scatter the laser, then the diffuser arrangedon the surface of the color filter wheel accurately rearrange the phasesof the laser.

It is noted that the particle diameter of the diffuser arranged on thesurface of the fluorescent wheel may also be smaller than the particlediameter of the diffuser arranged on the surface of the color filterwheel, for example, the particle diameter of the diffuser arranged onthe surface of the fluorescent wheel is 30 microns, and the particlediameter of the diffuser arranged on the surface of the color filterwheel is 100 microns.

In further demonstration, in comparison with the blue laser, the redlaser has a longer coherence length, and thus higher coherence,therefore, a speckle phenomenon is severer. Whereas in the dual-colorlaser light source provided by the embodiment of the presentapplication, the red laser is a converted light of the first red laserand the second red laser. Because the first red laser and the second redlaser are different polarized light, for example, the first red laser isp polarized light and the second red laser is s polarized light. Duringimage projection, overlay of the two polarized light is able to formoverlay of phase patterns, so as to generate more independent randomphase patterns, further weakening speckle effects of the red laser.

In summary, in the dual-color laser light source provided by theembodiment of the present application, because the red laser collectedby the light combining component is the converted light of the first redlaser and the second red laser with polarization directionsperpendicular to each other. Overlay of the two polarized light is ableto form overlay of phase patterns during image projection, so as togenerate more independent random phase patterns, which efficientlyweaken the speckle effects of the red laser while improve the opticalquality of the dual-color laser light source.

An embodiment of the present application provides a laser projector,which may include the dual-color laser light source as shown in any ofFIG. 2A, FIG. 2B, FIG. 4, and FIG. 6 to FIG. 9B.

The aforementioned descriptions are just optional embodiments of thepresent application, and are not intended to restrict the presentapplication. All the changes, equivalent replacement as well asmodifications made within the spirit and principle of the presentapplication shall fall into the protection scope of the presentapplication.

1. A dual-color laser light projection device, comprising a first bluelaser transmitter configured to emit a first blue laser, a second bluelaser transmitter configured to emit a second blue laser, a red lasertransmitter configured to emit a red laser, a light combining component,a fluorescent wheel, a light-pipe; wherein the fluorescent wheelcomprises a green fluorescent region provided with a green fluorescentpowder and a transmission region, and wherein the green fluorescentregion is configured to be excited by the first blue laser to generatesgreen fluorescence; the light combining component is disposed on a lightpath between the first blue laser transmitter and the fluorescent wheel,a light path between the light-pipe and the second blue lasertransmitter and a light path between the light-pipe and the red lasertransmitter; the light combining component is configured to receive thefirst blue laser, and to emit the first blue laser to the fluorescentwheel; the light combining component is also configured to receive thegreen fluorescence, the second blue laser and the red laser, and to emitthe green fluorescence, the second blue laser and the red laser to thelight-pipe.
 2. The laser light source according to claim 1, wherein, thefirst blue laser is incident to the light combining component along afirst direction, and is emitted to the fluorescent wheel along a seconddirection; the green fluorescence, the second blue laser and the redlaser are emitted to the light-pipe along a third direction.
 3. Thelaser light source according to claim 2, wherein, the first direction issubstantially same with the second direction.
 4. The laser light sourceaccording to claim 3, wherein, the first blue laser transmitter and thefluorescent wheel are oppositely disposed on two sides of the lightcombining component.
 5. The laser light source according to claim 3,wherein, the first direction is substantially perpendicular to the thirddirection.
 6. The laser light source according to claim 3, wherein, thefluorescent wheel is disposed on a light path between the lightcombining component and the red laser transmitter, the fluorescent wheelis provided with the transmission region; the red laser transmitted fromthe transmission region is incident to the light combining componentalong a fourth direction, and the green fluorescence is incident to thelight combining component along the fourth direction.
 7. The laser lightsource according to claim 2, wherein, the second blue laser of thesecond blue laser transmitter is incident to the light combiningcomponent along a direction substantially same with a third direction,and the light combining component is configured to emit the second bluelaser to the light-pipe along the third direction.
 8. The laser lightsource according to claim 2, wherein, the red laser of the red lasertransmitter is incident to the light combining component along adirection substantially same with the third direction, and the lightcombining component is configured to emit the red laser to thelight-pipe along the third direction.
 9. The laser light sourceaccording to claim 2, wherein, the fluorescent wheel is disposed on alight path between the light combining component and the red lasertransmitter and is disposed on an light path between the light combiningcomponent and the second blue laser transmitter, the red lasertransmitted from the transmission region and the second blue lasertransmitted by the transmission region are incident to the lightcombining component along a fourth direction, and the green fluorescenceis incident to the light combining component along the fourth direction.10-16. (canceled)
 17. The laser light source according to claim 1,wherein, a direction where the green fluorescence is emitted from thefluorescent wheel to the light combining component is substantiallyopposite to the direction where the first blue laser is emitted from thelight combining component to the fluorescent wheel.
 18. The laser lightsource according to claim 1, wherein, the first blue laser transmitteris disposed in a fifth direction from the light combining component, thefluorescent wheel is disposed in a sixth direction from the lightcombining component, the light-pipe is disposed in a seventh directionfrom the light combining component, and the second blue lasertransmitter is disposed in a eighth direction from the light combiningcomponent; the fluorescent wheel is disposed on a light path between thered laser transmitter and the light combining component, and the redlaser is emitted from the transmission region to be incident to thelight combining component, wherein the fifth direction, the sixthdirection, the seventh direction, and the eighth direction aredifferent.
 19. The laser light source according to claim 18, wherein,the first blue laser transmitter and the fluorescent wheel areoppositely disposed on two sides of the light combining component, thelight combining component is configured to transmit the first blue laserand reflect the green fluorescence, and the fifth direction is parallelto the sixth direction, but a direction of the fifth direction isopposite to a direction of the sixth direction.
 20. The laser lightsource according to claim 19, wherein, the light-pipe and the secondblue laser transmitter are oppositely disposed on two sides of the lightcombining component, the light combining component is configured totransmit the second blue laser, and the seventh direction is parallel tothe eighth direction, but a direction of the seventh direction isopposite to a direction of the eighth direction.
 21. The laser lightsource according to claim 1, wherein, the first blue laser transmitteris disposed in a fifth direction from the light combining component, thefluorescent wheel is disposed in a sixth direction from the lightcombining component, the light-pipe is disposed in a seventh directionfrom the light combining component; the fluorescent wheel is disposed onan light path between the red laser transmitter and the light combiningcomponent and is disposed on an light path between the second blue lasertransmitter and the light combining component, and the transmissionregion is configured to transmit the red laser, wherein the red laseremitted from the transmission region is incident to the light combiningcomponent, and the transmission region is configured to transmit thesecond blue laser, wherein the second blue laser transmitted from thetransmission region is incident to the light combining component,wherein the fifth direction, the sixth direction and the seventhdirection are different.
 22. (canceled)
 23. The laser light sourceaccording to claim 1, wherein, the first blue laser transmitter isdisposed in a fifth direction of the light combining component, thefluorescent wheel is disposed in a sixth direction of the lightcombining component, the light-pipe is disposed in a seventh directionof the light combining component, the second blue laser transmitter andthe red laser transmitter are disposed in a eighth direction of thelight combining component, wherein the fifth direction, the sixthdirection, the seventh direction and the eighth direction are different.